In this paper,precursor powders of Cr₃₊,Nd₃₊:GSGG laser ceramic were carried out by coprecipitation method with different ratio of Cr₃₊ and Nd₃₊. Polycrystalline materials were obtained at different sintering temperature. The phase transformation, micro-morphology and luminescent property were analyzed by XRD, TG-DTA, FESEM and fluorescence spectrum. And the optimum doped concentration of composite doping ions was characterized. The results show that GSGG nano-powder with uniform distribution can be obtained from the precursor powder at 900℃ sintering temperature, and the energy transfer mechanism between Cr₃₊ and Nd₃₊ can enhance the luminescence.